In the meantime, I had time to revise my first approach to the second comment. This was also necessary to avoid it becoming TLDR, although I'm almost certain I failed at that. So this is a little bit about the obstacles that the story entails and the graphics.
Spanning a gap of 18 years can be quite a challenge if you continue to use the same models. Apart from the MC (and his sisters, of course), all the other characters don't seem to age. The most obvious example of this is Detective Tamara, who looks like she's in her twenties throughout the game.
I know it can be difficult to make the female models look like they belong to different generations, but it doesn't seem right to do this just by making the girls shorter. After all, at the age of 18 you are an adult, not only legally but also physically. Also, I'd think the heights of the characters should be consistent. Example: In the clothes store Deborah looks to be taller than her mother, whereas in other scenes it's just the opposite. And there are a few pics where Juliet seems to be about 8 inch taller than Vanessa, not so much on all others.
Alright, strange positioning: first Vanessa's feet, in the living room with the MC and Tamara. She's wearing high heels, but her feet are flat on the floor. A little later Sandra comes in, also in high heels, but her toes are sinking into the carpet (one picture), or just her shoes (another picture). The positioning of arms and legs that I noticed is simply inappropriate in the respective situation. At the beginning of the party, Sandra crosses her legs in an un-ladylike way while wearing a skirt, and in the living room, the MC holds his left arm around Saeko and puts his hand on her chest.
The last two points are about hair issues and some recommendations that are probably down to my personal taste. I noticed some pics where Vanessa, Laura and Saeko's hair gets intermixed with the clothes. I'd think Juliet's butt is a bit too much, both in the leather pants and the next day in the kitchen. And Lily would probably look better if she wasn't wearing that dark eyeshadow with her tinted black glasses. I'd recommend a very light-coloured eyeshadow and/or a thinner frame for her glasses.
I'm looking forward to the next update and hope it wasn't too much criticism.
Good luck and have fun.